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  "title": "",
  "lang": "zh-CN",
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  "headers": [
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      "title": "促销活动案例",
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    },
    {
      "level": 3,
      "title": "策略模式类图",
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      "children": []
    },
    {
      "level": 3,
      "title": "策略模式实现",
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      "children": []
    },
    {
      "level": 3,
      "title": "适用场景",
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      "children": []
    }
  ],
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